深水桥梁墩水耦合振动试验研究与数值计算  

EXPERIMENTAL AND NUMERICAL INVESTIGATION ON PIER-WATER COUPLING VIBRATION OF BRIDGES IN DEEPWATER

作　　者：李乔[1,2] 刘浪[1] 杨万理[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]抗震工程技术四川省重点实验室,四川成都610031

出　　处：《工程力学》2016年第7期197-203,共7页Engineering Mechanics

基　　金：近海重大交通工程地震破坏机理及全寿命性能设计与控制973项目(2011CB013605-5);国家自然科学基金项目(51108383)

摘　　要：为研究深水桥墩动力特性以及动水压力分布规律,开展了本次墩水耦合振动台试验。通过比较试验结果与ANSYS-CFX计算结果验证了试验数据的有效性。通过数值拟合得到了动水压力沿桥墩截面周边以及水深的变化规律。提出附加刚度法对有水桥墩弹性振动问题进行数值模拟,结果表明:附加刚度法计算结果与试验结果相符,且能较好的解释实验原理;桥墩基频会随着水深的增加而增大,桥墩的响应随着水深的增加而减小;附加刚度法能较好地模拟深水桥梁墩水耦合弹性振动行为。In order to study the dynamic characteristics of deepwater piers and the distribution of hydrodynamic pressure on them, a pier-water coupling vibration test was conducted. By comparing the experimental results with the ANSYS-CFX calculation results, the effectiveness of the experimental data is verified. By numerical fitting, the variation of hydrodynamic pressure with varying pier section and depth is obtained. The elastic vibration of deepwater pier is simulated by using the additional stiffness method. It is shown that the calculation results from the additional stiffness method are consistent with the experimental results and the stiffness method can explain the experimental principles. The fundamental frequency of the pier increases with the increased depth; in addition, the response of the pier decreases with the increased depth. The additional stiffness method can be used to simulate the pier-water couoling vibration effectively.

关 键 词：深水桥梁 动水压力 弹性振动 附加刚度法 基频 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]